James Lovelock's acceptance that 90% of Earth's human population could perish is on a level with accepting events such as the Holocaust as minor incidents of history that will be forgotten in the course of time...

Jessica Marshall reports Jerome Wakefield's assumption that sadness must have some sort of useful evolutionary purpose, because it is entrenched in our biology. This is incorrect for a number of reasons...

This week's Feedback reveals how Aussie soap opera Neighbours taps into general relativity, why three-year-olds have mouths 20 centimetres wide, and offers you a last chance to enter our Darwin competition…